Circular pin headers consist of two parts: the male header (pin header) and the female header (socket). Male headers typically consist of metal pins and a plastic housing, while female headers contain metal holes and a plastic housing. These two parts, through precise design and manufacturing, achieve reliable mechanical and electrical connections.

Before selecting a circular pin header, its application environment must be clarified. For example, will the connector be used indoors or outdoors? Are waterproof or dustproof properties needed? Different application environments have different material and design requirements for the connector.

Based on circuit design requirements, determine the electrical parameters of the connector, such as current, voltage, and impedance. Ensure that the selected pin header meets the electrical performance requirements to guarantee the stability and reliability of the connection.

There are many reasons why round pin headers and sockets may have poor connections. First, surface oxidation is a common problem. Metal contacts exposed to air for long periods tend to form oxide films, which hinder good contact. Second, contamination is a major factor. Dust, dirt and other contaminants can adhere to contacts, affecting conductivity. Third, mechanical damage, such as excessive bending, twisting or improper insertion and removal, can also damage contacts and lead to poor connections. In addition, poor solder joints, contact surface wear, deformation, and excessive insertion/removal force are also common causes. Therefore, during use and maintenance, special attention should be paid to these factors to ensure a good connection between the round pin headers and sockets.